21. If € = 8.0 V, at what rate is the emf providing energy to the circuit shown?
15 2
10 22
12 V
+
1022.
a. 8.4 W
b. 7.6 W
C.5.6 W
d. 11 W
e. 2.0 W
​

Answer:

=18 sec

Explanation:

240m=20m/s, find 360m

360×20÷240=30m/s

time=distance÷speed

240÷20=12sec

if 240=12sec,find 360

360×12÷240

=18 sec

Answer:

a)

[tex]u(t)=0.499ft.e^{-\frac{144.76lb/s}{2(48lb)}t}cos(\omega t)\\\\u(t)=0.499ft.e^{-1.5t}cos(\omega t)[/tex]

b)

m = 48lb

c)

b = 144.76lb

Explanation:

The general equation of a damping oscillate motion is given by:

[tex]u(t)=u_oe^{-\frac{b}{2m}t}cos(\omega t-\alpha)[/tex]    (1)

uo: initial position

m: mass of the block

b: damping coefficient

w: angular frequency

α: initial phase

a. With the information given in the statement you replace the values of the parameters in (1). But first, you calculate the constant b by using the information about the viscous resistance force:

[tex]|F_{vis}|=bv\\\\b=\frac{|F_{vis}|}{v}\\\\|F_{vis}|=27lbs=27*32.17ft.lb/s^2=868.59ft.lb/s^2\\\\b=\frac{868.59}{6}lb/s=144.76lb/s[/tex]

Then, you obtain by replacing in (1):

6in = 0.499 ft

[tex]u(t)=0.499ft.e^{-\frac{144.76lb/s}{2(48lb)}t}cos(\omega t)\\\\u(t)=0.499ft.e^{-1.5t}cos(\omega t)[/tex]

b.

mass, m = 48lb

c.

b = 144.76 lb/s

Answer:

C. Television

Explanation:

Mostly in cathode ray television, a TV has many of different types of capacitors, used as connections between circuits, as timing components and as electronic filters. TV capacitors perform many functions.

capacitor acts as a reservoir for electric charge, storing and releasing electricity in precise amounts.

What is a Capacitor  ?

A capacitor is a simple device consisting of a pair of metal foils separated by a thin insulator, such as plastic, used basically for storing charge

Answer:

D) Heating and Cooling system

Explanation:

just took the test and got it right :)

Answer:

The percentage of an iceberg submerged beneath the surface of the ocean = 89.67%

Explanation:

Let V be the total volume of the iceberg

Let x be the volume of iceberg submerged

According to Archimedes principle,

weight of the iceberg = weight of the water displaced (that is, weight of x volume of water)

Weight of the iceberg = mg= ρ(iceberg) × V × g

Weight of water displaced = ρ(fluid) × x × g

We then have

ρ(iceberg) × V × g = ρ(fluid) × x × g

(x/V) = ρ(iceberg) ÷ ρ(fluid) = 916.3 ÷ 1021.9 = 0.8967 = 89.67%

Hope this Helps!!!!

Answer:

a)   y = 0.459 m , b)   t = 13 s

Explanation:

a) For this exercise we use Newton's second law to find the acceleration of the block

we fix a reference system with the x axis parallel to the plane and the y axis perpendicular to it

X axis

          -Wₓ - fr = m a               (1)

Axis y

          N - [tex]W_{y}[/tex] = 0

          N = W_{y}

the friction force has the formula

          fr = μ N

let's use trigonometry to find the components of the weight

          sin 25 = Wₓ / W

         Wₓ = W sin 25

          cos 25 = W_{y} / W

          W_{y} = W cos 25

we substitute in 1

          - W sin 25 - μ W cos 25 = m a

          - g (sin 25 - μ cos 25) = a

let's calculate

          a = - 9.8 (sin 25 - 0.12 cos 25)

         a - 0.25 m / s

this is the acceleration on the plane, so we can use the kinematic relations in one dimension

the highest point where the block rises the speed is zero (va = 0)

          v² = v₀² - 2 a y

           y = v₀² / 2g

          y = 3 2 / (2 9.8)

           y = 0.459 m

this is the distance the cantes block travels to stop

  b) the time of the entire journey is

               y = v₀ t - ½ a t²

the point where the body recesses is y = 0

            0 = (vo - ½ a t) t

whose solutions are

           t = 0

           0 = vo - ½ a t

           t = 2vo / a

           t = 2 3 / 0.459

           t = 13 s

Answer:

The temperature is   [tex]T = \frac{h}{H_O \alpha_{steel} } + T_O[/tex]

Explanation:

From the question we are told that

      The height on a cool spring day is [tex]H_O[/tex]

      The temperature on a cool spring day is  [tex]T_O[/tex]

      The difference in height between a cool spring day and a summer day  is     h

     The coefficient of static friction is [tex]\alpha _{steel}[/tex]

The mathematical relation for the linear expansion of the steel buiding is represented as

               [tex]h = H_o \alpha_{steel} [T-T_O][/tex]

Where T is the temperature of the steel during summer

Now making T the subject we have

                [tex]T = \frac{h}{H_O \alpha_{steel} } + T_O[/tex]

Answer:

[tex]T = 6.75\,N\cdot m[/tex]

Explanation:

Vectorially speaking, torque is the cross product between force and distance from fulcrum. Its magnitude is equal to the following expression:

[tex]T = F\cdot r \cdot \sin \theta[/tex]

[tex]T = F_{\bot} \cdot r[/tex]

Let assume that force is perpendicular to the distance from the fulcrum. So, the torque needed to turn the bolt is:

[tex]T = (15\,N)\cdot (0.45\,m)[/tex]

[tex]T = 6.75\,N\cdot m[/tex]

Answer:

The Prime Meridian

The invisible line that passes through the North Pole and the South

Pole is called Earth's axis.

The imaginary line connecting the North and South poles is known as the Earth's axis. Its orbital plane and it are at an angle of 66 (1/2) degrees.

The Earth rotates on a 22 1/2-degree axis rather than vertically. A compass's arrow always points north when being used. The South Pole is located at the southernmost point on Earth, whereas the North Pole is located at its northernmost point. The region near the North and South Poles is extremely cold, whereas the region around the equator is extremely warm.

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Answer:

the tension in the string is 5.59 N

Explanation:

Here ,

m_1 = 0.385 Kg

m_2 = 0.710 Kg

Using second law of motion ,

a = F_net / effective mass

a = (0.710- 0.385)×9.8/(0.710 + 0.385 + 0.0125/0.15^2)

a = 1.93 m/s^2

Now , let tension be T ,

then,

mg-T=ma

0.710×g - T = 0.710×1.93

T = 5.59 N

the tension in the string is 5.59 N

Answer:

true a and c

Explanation:

The theory of special relativity is formulated under two postulates

* that the laws of physics are the same in all inertial systems

* that the speed of light in the vacuum is constant for all systems

with these postulates the energy of a particular is

        E = K + m c²

where the last term is called energy at rest

a) True. only when m = 0 the energy of the particle is scientific energy

be False. Nothing can go faster than light

c) Right. In a material medium the speed of light depends on the measurement reference frame

d) False For a particle of finite mass the energy must be greater than the energy at rest

Answer:

R = 73.25 m

Explanation:

We have,

Initial speed of the ball is 27 m/s

It is projected at an angle of 40 degrees

The maximum range of the ball is given by :

[tex]R=\dfrac{u^2\sin2\theta}{g}[/tex]

Plugging all the values we get :

[tex]R=\dfrac{(27)^2\sin2(40)}{9.8}\\R=73.25\ m[/tex]

So, the maximum range of the ball is 73.25 m

Answer:

400 W

Explanation:

Ignoring the efficiency rating for the transformer we have to assume 100% .. Also, the power input to primary is equal to the power output in secondary.

This means that power input = 400 W = power output

Answer:

Explanation:

heat lost by water will be used to increase the temperature of  ice

heat gained by ice

= mass x specific heat  x rise in temperature

1 x 2090 x t

heat lost by water in cooling to 0° C

= mcΔt  where m is mass of water , s is specific heat of water and Δt is fall in temperature .

= 1 x 2 x 4186  

8372

heat lost = heat gained

1 x 2090 x t  = 8372

t = 4°C

There will be a rise of  4 degree in the temperature of ice.  

The increase in the temperature of the ice to bring the water to 0 °C is 4 ⁰C.

The given parameters;

Apply the principle of conservation of energy to determine the increase in the temperature of the ice to bring the water to 0 °C.

Heat absorbed by the ice = Heat lost by water

[tex]Q_{ice} = Q_{w}\\\\mc\Delta t_{ice} = mc \Delta t_{w}\\\\1 \times 2090 \times \Delta t = 1 \times 4186 \times (2-0)\\\\2090\Delta t = 8372\\\\\Delta t = \frac{8372}{2090} \\\\\Delta t = 4 \ ^0C[/tex]

Thus, the increase in the temperature of the ice to bring the water to 0 °C is 4 ⁰C.

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Answer:

Unequal Wavelengths

Explanation:

Got it right on the exam

Unequal wavelengths limit interference between waves because the waves will have different frequencies and will not be able to form a stable interference pattern. When waves of different wavelengths interact, they will interfere constructively and destructively at different points, creating an unpredictable pattern.

Answer:

Unequal wavelengths

Explanation:

Got it correct on the quiz.

Answer:

The purpose of adding force vectors is to determine the net force acting upon an object. In the above case, the net force (vector sum of all the forces) is 0 Newton. ... We would say that the object is at equilibrium. Any object upon which all the forces are balanced (Fnet = 0 N) is said to be at equilibrium.

Explanation:

hope that helps you

Answer:

Explanation:

When an unplanted tree is pulled across the lawn then a variety of forces will be acting on the tree i.e.

1.There will be gravity force

2.Friction force to oppose the motion

3.Applied force which is pulling the tree

4. Normal force in response to the gravity force.

Answer:

The velocity of the ball is 3.52 m/s.

Explanation:

A projectile is any object that moves under the influence of gravity and momentum only. Examples are; a thrown ball, a fired bullet, a kicked ball, thrown javelin, etc.

Given that the ball was thrown vertically upward on the top of a skyscraper of  height 61.9 m. So that the velocity can be determined by;

      u = [tex]\sqrt{\frac{2H}{g} }[/tex]

Where: u is the velocity of the object, H is the height and g is the gravitational force on the object. Given that: H = 61.9 m and g = 10 m/[tex]s^{2}[/tex], then;

 u = [tex]\sqrt{\frac{2*61.9}{10} }[/tex]

   = [tex]\sqrt{\frac{123.8}{10} }[/tex]

u  = 3.5185

The velocity of the ball is 3.52 m/s.

Answer:

Explanation:

Three forces are in equilibrium .

Let us represent forces in vector form ie in the form of i and j .

F₁ is acting along positive x axis ( at a 0° angle )

F₁ = 12 i

F₂ is acting along positive y axis ( at a 90° direction)

F₂ = 18 j

Suppose F₃ is represented by X i + Y j

Total of three forces is zero .

F₁ + F₂ + F₃ = 0

12 i + 18 j + F₃ = 0

F₃ = - 12i - 18 j

So x - component of F₃ = - 12 i

X - component of F₃ is equal to 12 N in magnitude and is acting in negative x direction ie at 180° direction .

similarly y - component is 18 N acting in negative y direction.

Answer:

x-component: -12

y-component- -18

Explanation:

Answer:

Explanation:

For discharge of capacitor in RC circuit , the relation is as follows

[tex]V=V_0e^\frac{-t}{\lambda}[/tex]

V is voltage across the capacitor , V₀ is maximum  voltage across capacitor  , λ is time constant and t is the time after which the voltage is recorded. During discharge this will also be voltage across resistance .

Taking log on both sides

lnV = lnV₀   -  [tex]\frac{t}{\lambda}[/tex]

Given equation

[lnV] = - .027 t + 2.5

Comparing these equation

[tex]\frac{1}{\lambda} = .027[/tex]

λ = 37 s

time constant = 37 sec.

Answer:

mercury ,venus, earth

Answer

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Answer:

662480 J

Explanation:

The heat required to convert 0.8Kg of ice at -35°c to steam at 100°c is the sum of the heat required to raise the temperature of the ice from -35°c to 0°C, the latent heat of fusion of ice and the heat required to raise the temperature of the ice from 0°c to 100°c.

Latent heat of fusion for ice= 3.36× 10^5 J Kg-1

Specific heat capacity of ice= 2060 J kg−1K−1

Specific heat capacity of water= 4200 JKg-1K-1

Heat required to raise the temperature of the ice to fusion point

H= 0.8 × 2060 × [0-(-35)]

H= 57680 J

Latent heat of fusion of ice;

H= mL

H= 0.8 ×3.36× 10^5

H= 2.688×10^5 J

Heat required to raise the temperature of the water to 100°C

Since mass is conserved, the mass of ice that has melted has been turned into an equivalent mass of water.

Therefore mass of water formed= 0.8Kg

H= 0.8× 4200 × 100

H= 336000J

Therefore total heat required;

H= 57680 + 2.688×10^5 + 336000

H= 662480 J

Answer:

2468,080j

Explanation:

Answer:

40N

Explanation:

Answer:

There is less gravitational force in space.

Explanation:

Gravity doesn't exist as it does on Earth. Earth's gravity is as 6 times stronger as it is on the moon.

Answer:

Alpha particle

Explanation:

Alpha particles emitted by radioactive nuclei consist of 2 protons and 2 neutrons bound together which makes it neutral and are able to pass through ordinary matter almost undisturbed

Answer:

The answer is 1

Explanation:

It's fr 1

Sinec the light rays bends away from the normal when it enters into medium 2, the denser medium is medium 1.

Refraction is the bending of light waves at the boundary of media of different densities.

During refraction, if light travels from less dense to a denser medium, the light rays is bent towards the normal.

However when light travels from denser to less dense medium, the light rays bends away from the normal.

Therefore, since the light rays bends away from the normal when it enters into medium 2, the denser medium is medium 1.

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Answer:

Explanation:

he created the bulb first. He was an American. He was an inventor and also a businessman. Moreover he invented the phonograph, and the motion picture camera, as well as improving the telegraph and telephone.

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